This is the 3706th most frequent Russian word.
указанием
"Указанием" - "instruction" or "indication."
Here, "указанию" is used in the sense of a direction or instruction from an authoritative source.
По указанию начальника мы начали проект.
By the order of the manager, we started the project.
In this sentence, "указание" refers to a piece of advice or a specific tip.
Его указание помогло нам избежать ошибок.
His instruction helped us avoid mistakes.
Here, "указанию" denotes guidance or directive given by someone.